The Impact Assessment Of Ecological Enviroment Vulnerability Based On Land Use/Cover Change In Changbai Moutain Area

With the passage of time and economic development,the global environmental change problem has become increasingly serious and has received much attention.In recent years,the constant changes in natural conditions combined with the improvement of the intensity of land development and utilization by human beings,the contradictions between human and land have gradually emerged.The extensive use of land by humans and unreasonable human disturbance have caused great changes in land,and land use/cover change will profoundly affect the fragility of the ecological environment.Land use/cover change is the most direct manifestation of the interaction between human activities and the natural environment.Just the characteristics of ecological vulnerability are influenced by both human and natural factors.Studying the impact of land use/cover change on ecological vulnerability can not only deeply explore the driving factors of ecological environment vulnerability,but also provide scientific reference and theoretical basis for land use planning and ecological environment protection in the study area.In this paper,the Changbai Mountain area is used as a research area,and a variety of data sources such as remote sensing image data,topographic data,natural condition data and socio-economic data are used in combination.The literature method,analytic hierarchy process,remote sensing and GIS technology methods and VSD ecological vulnerability assessment are integrated.The research methods such as the model obtained the data of land use/cover change and ecological environment vulnerability in 2000,2010 and 2015 respectively.Through the above basic data,the evolution of land use/cover change in the study area was deeply studied.The spatial and temporal evolution of the mechanism and ecological environment vulnerability and the former’s influence on the latter and corresponding countermeasures are given.The main conclusions are as follows:(1)During the period from 2000 to 2015,the land change range of the study area is more obvious,and the absolute value of the total change area is 908.74 square kilometers.Among them,the largest area is forest land,and the largest area is cultivated land.The largest area of change is the construction land,which is 13.23%.Among the land conversion/cover types,the conversion of forest land and cultivated land is the most obvious.(2)The ecological environment vulnerability level of the study area was medium in 2015,and the non-fragile area and the general vulnerable area accounted for 48%of the total area,but 33%of the total area is still relatively vulnerable.Vulnerability presents a general pattern of high in the southwest and east,low in the northeast and south.The areas with high vulnerability include Yanji City,Longjing City,Tumen City and its junctions,Meihekou City,Huinan County,Liuhe County and their junctions.The less vulnerable areas are Wangqing County and Linjiang City.In the past 15 years,the overall ecological environment vulnerability of the study area has been rising.Only in the southwestern part of the city,the fragile value is mainly due to decline.(3)During the period of 2000-2015,the level of ecological environmental vulnerability under different land use/cover types was significantly different.Woodland is dominated by low-intensity and vulnerable areas.In contrast to forest land,cultivated land is dominated by high-intensity vulnerable areas,but in recent years,high-intensity vulnerable areas are becoming smaller and more vulnerable areas are increasing.The ecological environment fragility pattern of grassland shows that the medium-strength vulnerable area is relatively high,and the fragile pattern of wetland is evenly distributed,but it is still dominated by very vulnerable areas.More than 50%of the land for construction land and bare land is in a high-intensity and fragile area,and the ecological environment is more severe.(4)Land use/cover change has caused an increase in the vulnerability of the ecological environment as a whole.The land use/cover conversion that leads to the increase of ecological vulnerability is mostly the conversion of forest land and grassland to other land types.The conversion of cultivated land area is mainly based on vulnerability,while the conversion of construction land and bare land will almost reduce vulnerability.When the construction land is converted into forest land from 2000 to 2015,the vulnerability of all conversion areas will decrease.